No charge for data via WiFi confirmed by AT&T
I finally got confirmation from AT&T (copy of email below) that there is no charge for WiFi data. They were reluctant to confirm that because they would prefer to sell an international data package. To ensure that you are not charged for any data downloads overseas: Make sure you have the latest iPhone software update, go to "Settings", "General", "Network" and make sure the "Data Roaming" is OFF. This turns off Edge if you're out of your service area (USA).
I don't leave for Italy until Thanksgiving but I'm confident I've at least got the iPhone details figured out.
Exerpt from AT&T E-mail:
Thank you for taking the time to email the new AT&T regarding the
difference in charges for Edge date use and Wi-Fi usage while abroad. I
am happy to help you with your inquiry.
I apologize for any misinformation about international data usage. If
the iPhone is on a Wi-Fi network, then there will not be data charges.
However, if the edge network is used, then the charge would be .0195
per
KB that is downloaded.
Internet Cafes might charge a fee to access Wi-Fi, but you would not be
charged for any data usage while using Wi-Fi.
The data package that is on your account is for domestic data usage
only
in the United States. The package does not cover international data
usage.
Please note that if you use the Edge network while abroad, then the
charges for data can be very high. Even moderate Edge usage can be
expensive.